Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (1): 1-6.doi: 10.3969/j.issn.1000-565X.2011.01.001

• Electronics, Communication & Automation Technology •     Next Articles

Production of Phenolic Chemicals via Liquefaction of Alkali Lignin from Bagasse

Sui Xin-jin1 Wu Shu-bin1,2   

  1. 1. The south China university of technology of the pulp and paper engineering state key laboratory, guangdong guangzhou 510640; 2. The Chinese academy of sciences renewable energy and natural gas hydrate key laboratory, guangdong guangzhou 510640)
  • Received:2010-05-05 Revised:2010-08-30 Online:2011-01-25 Published:2010-12-01
  • Contact: 武书彬(1965一)，男，教授，博士生导师，主要从事生物质化学与化工、二次纤维清洁高效利用等的研究 E-mail:shubinwu@scut.edu.cn
  • About author:隋鑫金(1982一)，男，博士生，主要从事生物质热化学转化高品位燃料与化学品研究
  • Supported by:

    国家“973”计划项目(2007CB210201)；国家“863”计划项目(2007AA05Z456)；中国科学院可再生能源与天然气水合物重点实验室开放基金资助项目(0807K1)

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Abstract:

In order to increase the utilization value of alkali lignin from bagasse,aluminium silicate was chosen as the catalyst to produce phenolic chemicals from the lignin via a liquefaction process.The reaction conditions including aluminium silicate dosage,heating time,heating temperature and liquid-solid（glycerol-bagasse alkali lignin） ratio were then optimized as follows： an aluminium silicate dosage of 4%（based on the dry bagasse alkali lignin）,a heating duration of 1 h,a heating temperature of 270℃ and a liquid-solid ratio of 6 mL/g（based on the dry bagasse alkali lignin）.In these conditions,phenolic chemicals mainly containing 2,6-dimethoxy-phenol,2-methoxy-phenol and phenol were produced,with a total yield of 54.10%.Moreover,the structures of functional groups of the alkali lignin before and after the liquefaction were analyzed by means of FT-IR and 1H NMR.The results show that,when the heating temperature reaches 270 ℃,the propane units of the phenylpropane separate from benzene units in the presence of aluminium silicate,and the β-ether lingkages（β-O-4） break due to high temperature and the existence of acid.At the same time,few α-ether lingkages（α-O-4） break to produce phenols following the separation of propane units.

Key words: bagasse, alkali lignin, liquefaction, glycerol, phenolic chemical